"If a process can be fully defined, with all things known about it so that it can be
designed and run repeatably with predictable results, it is known as a defined
process, and it can be subjected to automation. If all things about a process aren't
fully known -- only what generally happens when you mix these inputs and what
to measure and control to get the desired output -- these are called empirical
processes."
"A defined process is predictable; it performs the same every time. An empirical process requires close watching and control, with frequent intervention. It is chaotic and unrepeatable, requiring constant measurement to ensure the desired result."
"Models of empirical processes are derived by categorizing observed inputs and outputs and defining the controls that cause them to occur within prescribed bounds. Empirical process modeling involves constructing a process model strictly from experimentally obtained input/output data, with no recourse to any laws concerning the fundamental nature and properties of the system. No a priori knowledge about the process is necessary; a process is treated like a black box."
"[S]cientists inspected the systems development process. They concluded that many of the processes, rather than being repeatable, defined, and predictable, were unpredictable and unrepeatable. With that, the scientists explained the difference between defined processes and empirical processes."
"The scientists stated, 'We are most amazed that your industry treats these illformed processes as defined, and performs them without controls despite their irregular nature. If chemical processes that we don't understand completely were handled in the same way, we would get very unpredictable results.'"
"The scientists recommended -- since our business is an empirical process -- that we use measurements and controls, as done elsewhere in the physical world. The scientists provided the concepts of defined and empirical processes .. and they told us that we needed controls to manage the empirical systems development process."
"A defined process is predictable; it performs the same every time. An empirical process requires close watching and control, with frequent intervention. It is chaotic and unrepeatable, requiring constant measurement to ensure the desired result."
"Models of empirical processes are derived by categorizing observed inputs and outputs and defining the controls that cause them to occur within prescribed bounds. Empirical process modeling involves constructing a process model strictly from experimentally obtained input/output data, with no recourse to any laws concerning the fundamental nature and properties of the system. No a priori knowledge about the process is necessary; a process is treated like a black box."
"[S]cientists inspected the systems development process. They concluded that many of the processes, rather than being repeatable, defined, and predictable, were unpredictable and unrepeatable. With that, the scientists explained the difference between defined processes and empirical processes."
"The scientists stated, 'We are most amazed that your industry treats these illformed processes as defined, and performs them without controls despite their irregular nature. If chemical processes that we don't understand completely were handled in the same way, we would get very unpredictable results.'"
"The scientists recommended -- since our business is an empirical process -- that we use measurements and controls, as done elsewhere in the physical world. The scientists provided the concepts of defined and empirical processes .. and they told us that we needed controls to manage the empirical systems development process."
Controlled-Chaos Software Development.
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